Improvement in band-saws



c. A. YOUNG.

Band-Saws.

Patented June 3,1873.

UNITED STATES.

CHARLES A. YOUNG, OF PROVIDENCE, ASSIGNOR OF ONE-HALF HIS RIGHT PATENT()FFICE.

TO PARDON F. BROWN, OF MANTON, RHODE ISLAND.

IM PROVEMENT IN BAND-SAWS.

Specification forming part of Letters Patent No. 139,6 14, dated J one3, 1873 application filed May 14, 1873. l

T 0 all whom it may concern:

Be it known that I, CHARLES A. YOUNG, of the city and county ofProvidence, in the State of lthode Island, have invented a certain newand useful Improvement; in Band- Saws.

My invention relates particularly to the general class of machines whichare adapted to execute scroll-sawing; and it consists in the novelcombination and arrangement of the saw driving and guiding or carryingmechanism,whereby a band-saw and a reciprocatingsaw may be alternatelyapplied thereto and operated thereon; and in a certain novelsawtightener pertaining thereto, hereafter more fully described.

It has long been demonstrated that, for executing scroll-work having acontinuous outline or accessible inner lines, the band-saw deservedlystands at the head of all others, as well from its complete andeffectual clearance as from its continuous cutting action.

So valuable are these saws for executing the class of work mentionedthat many large shops employ them for outlines, and also employ separateand distinct sawing-machines of the reciprocating or jig order forexecuting the interior lines or otherwise nonaccessible cuts. Aside fromthe space which these separate machines must occupy, and the first costof the said machines, there is involved the expense of handling thematerial attendant upon the conveyance of it from one machine to theother, and also the additional expense of the additional shafting,belting, and pulleys essential for the running of the second machine. Ithas, therefore, long been a desideratum that the two kinds of sawsshould be so arranged in one machine that either could be employed atwill, and, although arranged that they can be employed at will withslight changes for operating either of the two saws. As a result of myinvention I claim to have produced a machine adapted to operate with thesame mechanism-a jigsaw, as well as a band-saw or vice versa, and onewhich will operate either saw as efficiently as any machine can possiblyoperate either of the saws to which it may be exclusively adapted, andalso one which involves but little additional expense on account of itscomplex capabilities; and I do hereby declare that the followingspecification taken in connection with the drawings furnished and forming a part thereof is a clear and true description of sawing-machinesembodying all the features of my invention.

Referring to the drawings, Figure 1 represents one of my complexsawing-machines in perspective and arranged to operate the bandsaw. Fig.2 represents the same arranged to operate a jig-saw. Fig. 3 representsthe'same with an upper guiding-pulley of diiferent construction. Fig. 4represents the same upper guiding or carrying pulley in section and sideview on a somewhat enlarged scale.

In all of the figures, A denotes the frame of the machine, and consistsof the bed a and overhanging bracket 11. B denotes the table, which islocated beneath the bracket on the bed. For small light saws the bedmaybe fitted for attachment to a work-bench, andin heavier machinesmounted on legs common to machines of this general character. 0 denotesthe main driving-shaft. It is fitted to bearings in the frame, and maybe provided at one end with a belt-pulley, c, and at the other with thesaw-driving pulley D, or the belt-pulley and saw-driving pulley may beunited in one and mounted on a stud occupying the position in which theshaft 0 is shown.

The saw-driving pulley D is essentially provided with a link connection.As shown in the drawings, it may be a detachable linkbolt, d, whichengages in a tapped hole in the side of the pulley, or it may bepermanently attached thereto. E denotes the upper guidin g orsaw-carrying pulley, which can be made in several different forms, andoperatewith equal efficiency. In Figs. 1 and 2 itis in two distinctpieces, both of which are loosely mounted on a stud, which projects fromthe side of the outer end of the overhanging bracket 1). The inner onenext the bracket is wholly free to revolve on the stud, but the outerone is provided with an interior chamber, in which is a spiral spring,secured at one end to the pulley near its rim, and at the other end tothe stud, in a manner well known. so that a rotative movement of thepulley will be resisted in a measure by the force of the spring. Theexterior rim of this outer pulley is provided with. a stud or bolt, withwhich the strap of a jig-saw can readily be made to engage in a mannerwell known. In Figs. 3 and 4 the pulleyE is provided with a side recess,and a peripherical opening and clamp, e, for receiving the end of thejig-saw strap. Mounted on the stud, closely adjacent to the recessedface of the pulley, is a loose collar, f, which is provided with aset-screw, whereby it may beat will secured to the stud. The sameset-screw secures to the collar the end of a spiral spring, g, theopposite end of which is made to engage with the pulley near its rim bymeans of a clamp or pin. For effecting a counterbalance on the pulley,any excessive presence of metal at one point near the rim should beoffset by a corresponding excess at the point exactly opposite, as iscommon in like instances in other machines. F denotes the lowersaw-carrying pulley. It is loosely mounted on a stud, which extends fromthe side of the bed of the frame, and is parallel with the main shaftand the upper stud.

The pulley F may be made with a wide rim, and provided near its outeredge with a jigsaw strap-holdin g device, h, or it may be made in twosections, like the upper pulley E in Fig. 1. On the outer side of thepulley F, however constructed, is a link connection, h, which can beconstructed as the connection 01, already described. Should the pulley Fbe made in one piece, it will be provided with a peripherical clamp forengaging the strap of the jig-saw, in a manner already described, andshown in Figs. 3 and 4. G denotes a band-saw, which extends over thesaw-driving pulley, and the two\ guiding-pulleys, passing down through asuitable saw-slot in the table B, as shown in Fig. 1. H denotes ajig-saw provided with the usual end straps, which engage with the upperand lower carrying-pulleys respectively. To operate the jig-saw theband-saw is detached, the jig applied, and the shackle-bar or link I isconnected at the ends with the driving-pulley and lower'guiding-pulley.The continuous rotation of the main shaft will, therefore, according asthe machine may be adjusted, produce a continuous downward movement'atthe table with one saw, or a reciprocating movement with the other. Theseveral sawpulleys will preferably be clothed on their faces with asuitable materialas, for instance,

leather or rubber-An order to secure frictional contact with theband-saw and prevent it from slipping.

It will be seen by the novel arrangement of.

the driving and guiding pulleys, that I am enabled to attain any desiredtable space without the necessity of using large upper and lower wheels.For small light machines this arrangement of the pulleys is of specialvalue, as the machine can thereby be made with less height, and muchlighter, than if the two large wheels are employed.

Although embodied in this particular machine, and described and claimedherein, my straining and steadying rollers are well adapted for use, andhave more or less value in machines capable of operating but one ofeither of the two kinds of saws.

The rollers or wheels K- are each loosely mounted on a stud whichprojects from an adjustable frame, L, which is provided with athumb-screw, t", by means of which. it can be moved to and from the faceof the saw-carrying or guiding pulley. The upper frame L is attached tothe outer end of the bracket b, and the lower one to the bed beneath thetable. In each instance they are set on a line with the axis of theadjacent pulley, so that when forced into contact with the face of thepulley or the interposed saw it will hear at the point where the latterleaves the face of the pulley. Preferably these rollers K will becovered with some elastic material adapted to frictionally engage withthe saw-blade.

It will be seen that the bite on the saw is at the two ends of thevertical line, and that any sudden strains on that portion of the saware prevented from being injuriously communicated to the portions of thesaw which are in transit over the pulleys.

A band-saw is but little liable to break if it be firmly held in itsplace at the top and bot tom of the vertical portion, and when pressedagainst the faces of the guiding-pulleys, as is done by the rollers K,all sudden strains or jerks are materially modified before they can acton the portion of the saw which is in contact with the pulley, or thatportion which ex tends between the guiding and driving pulleys.

It will be seen that the additional devices and variations inconstruction by which,for instance, a simple band-sawing machine may beconverted into a complex machine of the character described, involve butslight additional expense, and it is safe to allege that the complexmachine will not cost to exceed ten or fifteen per cent. more than woulda simple machine of either class, and that it is therefore well adaptedto meet the requirements of the trade.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a complex scroll-sawing machine thecombination, substantially as described, of the table, the overhangingframe, the sawdriving pulley provided with a link connect-ion, and thecarrying-pulleys provided with gig-saw clamps or studs, and with a linkconnection whereby the same organization of mechanism may be made tooperate a bandsaw or a reciprocating saw, 1n the manner substantially asset forth.

2. Theeombination of the band-saw, the driving-pulley, and theguiding-pn1leys,herein described, and their arrangement with relation tothe table, as specified, whereby great depth of table can be attained inthe direction of the driving-pulley, as set forth.

CHARLES A. YOUNG.

Witnesses:

HENRY MARTIN,

JOHN G. PURKIS.

